Device for false-twist texturing of textile yarns

ABSTRACT

A device for false-twist texturing of textile yarns has two axially parallel rotatable rollers for supporting at least one twist tube in a cuneal throat between the rollers and in tangential contact with the roller rims, and a magnet for pressing the same against the rollers, the magnet consisting of at least one axially polarized magnet element and pole pieces connected with same and the same arranged and shaped so that it does not extend beyond the contours of the rollers.

United States Patent 91 Raschle [111 3,831,366 [451 Aug. 27, 1974 1 DEVICE FOR FALSE-TWIST TEXTURING OF TEXTILE YARNS [75] Inventor: Josef Raschle, Butschwil,

Switzerland [73] Assignee: Heberlein & Co. AG, Wattwill,

Switzerland [22] Filed: Nov. 1, 1973 [21] Appl. No.: 411,799

[30] Foreign Application Priority Data Primary ExaminerDonald E. Watkins Attorney, Agent, or FirmFitzpatrick, Cella, Harper & Scinto [57] ABSTRACT A device for false-twist texturing of textile yarns has two axially parallel rotatable rollers for supporting at Nov. 16, 1972 Switzerland 16717/72 least one twist tube in a cuneal throat between the rol- [52] U S Cl 57/77 45 lers and in tangential contact with the roller rims, and [51] Int Cl IIIIIIIIIIIIIIIIIIIIIII 2 a magnet for pressing the same against the rollers, the [58] Fieid 57777 45 magnet consisting of at least one axially polarized magnet element and pole pieces connected with same and the same arranged and shaped so that it does not [56] :;q extend beyond the contours of the rollers.

3,308,614 3/1967 Stahlecker 57/77.45 16 Claim 11 Drawing Figures PATENTED AUG 2 7 I874 smnur 5 ywnnnllllm.

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DEVICE FOR FALSE-TWIST TEXTURING OF TEXTILE YARNS gential contact with the rims of the rollers, one of the rollers being driven and the other idling and serving as a guiding roller. Magnets are used to press the twist tubes against the rollers. In one embodiment of this known device, the rollers each consist of two parallel discs which are maintained at a predetermined distance from each other by spacers, and the magnet is a horseshoe magnet with pole shoes extending into the space between the discs and the bight end of the magnet position well beyond the outer contour or circumference of the discs. (See US. Pat. Nos. 3,058,289; 3,267,657).

Such false-twist devices are used in texturing machines having a plurality of processing stations situated beside each other. It is essential that the lateral space consumption of these false-twist devices should be as small as possible since, in order to achieve high capacity of the texturing machine, one naturally tends to lodge the greatest possible number of processing stations in given dimensions of the machine.

The disadvantage of the above-mentioned false-twist device consists in that its lateral space consumption is relatively large towards the adjoining processing stations owing to the magnetic system used in these devices. It is the purpose of the present invention to provide an improved false-twist device by which this disadvantage is eliminated and in which the magnetic system does not protrude beyond the contours of the driving and idling rollers of the twist tubes.

The difficulty hereby consists in that it is not sufficient merely to use a magnetic system of more structural height as this would call for a greater distance between the discs of the rollers, and the associated twist tubes would have to be longer in order to be supported on the discs of the rollers.

Longer twist tubes would, however, jeopardize the required high revolution speeds of far above 500,000 r.p.m. It is therefore essential to permit maintenance of the structural height usual up to now, or even to reduce the same in certain cases. It is furthermore important for the magnet to be easily removable from the device if the rollers have to be removed from the roller shafts for renewal of worn discs, for example.

I have conceived apparatus by which I am able to overcome the foregoing difficulties. Thus, in one aspect of my invention I provide a device for false-twist texturing of textile yarns containing two axially parallel rollers rotatable about their axes and adapted to support at least one twist tube in a cuneal throat between the rollers and in tangential contact with the rims of the rollers and a magnet for pressing the same against the rollers, characterized in that the magnet consists of at least one axially polarized magnetic element and pole pieces connected with limiting faces of the same and so shaped and arranged that it does not protrude beyond the contours of the rollers.

For the magnetic element, hard magnetic materials such as alloys of aluminum, nickel and cobalt, the energy content of which is as high as possible, come into consideration. For the magnetic flux conducting pieces, soft magnetic materials such as iron have proved particularly suitable.

There has thus been outlined rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinaftter and which will form the subject of the claims appended hereto. Those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures for carrying out the several purposes of the invention. It is important, therefore, that the claims be regarded as including such equivalent constructions as do not depart from the spirit and scope of the invention.

Specific embodiments of the invention have been chosen for purposes of illustration and description, and are shown in the accompanying drawings forming a part of the specification wherein:

FIG. 1 is a front elevational view of a false-twist device according to the present invention;

FIG. 2 is a top plan view of the device of FIG. 1;

FIGS. 30, 3b and 3c illustrate a first embodiment of the magnet and details thereof in top view;

FIG. 4 illustrates a second embodiment of the magnet in top view;

FIGS. 5a and 5b illustrate a third embodiment of the magnet in top view and side elevation, respectively; and

FIGS. 6a, 6b and 6c illustrate a fourth embodiment of the magnet in top view and front elevation, respectively.

Referring now to FIGS. 1 and 2 of the drawing, it will be seen that the device according to my invention includes a carrier plate 1 on which the vertical shafts 2, 3 are arranged in suitable bearings. On the shafts 2 and 3 I mount rollers 4 and 5, each of which consists of two discs 4, 4" and 5', 5", which are separated by spacers 4" and 5". In one of the cuneal throats formed by the discs 4', 4' and 5', 5", the twist tube 6 is supported in parallel with the roller shafts, the twist tube being pressed against the disc rims by means of a magnet 8 fixed on a support of non-magnetic material, for example, brass, which may be mounted on the plate I.

The magnet may be shaped as shown in FIG. 3a, i.e. consist of a squared magnetic element 9, the direction of polarization of which extends perpendicular with respect to the axis of the twist tube 6. On limiting faces 10, 10' extending transversely with respect to the direction of polarization, I fix magnetic flux leading pieces or pole pieces 11, 12 which have pole shoes 13, 14 extending at an angle of with respect to the pole pieces. The free ends of pole shoes 13, 14 form parallel surfaces which, as shown in FIG. 3b, may have cut edges facing towards the twist tube 6. The pole shoe ends furthermore, as shown in FIG. 3c, may be provided with recesses l5, 15 in the form of circular sectors in the range of the twist tube 6.

FIG. 4 shows an arrangement wherein I employ a twist tube in either or both cuneal throats formed by the discs. In this case a magnet with two squared magnetic elements 9, 9 are arranged on the sides of the twist tubes 6, 6' and extend in parallel with each other and transversely with respect to a connection line drawn between the shafts of rollers 4, 5. On the limiting face of each of the magnetic elements 9, 9"extending transversely with respect to the direction of polarization and turned away from the twist tubes, is fixed a leg of the U-shaped pole piece 16 which itself is rigidly connected with the support 7. On the limiting faces of the magnetic elements 9, 9' facing the twist tubes and extending transversely with respect to the direction of polarization, 1 place squared shoes 17, 18. With this embodiment of the magnet 8, the twist tubes 6, 6 supported in both cuneal throats of the rollers 4, can be pressed against the disc rims. I

In the embodiments according to FIGS. 3a 3c and 4, the magnetic flux extends transversely with respect to the longitudinal axis of the twist tube or tubes through the same.

FIGS. 5a and 5b show a magnet which is shaped so that the magnetic flux extends longitudinally through the twist tube 6. The magnet consists of a square magnetic element 9, the direction of polarization of which extends in parallel with the axis of the twist tube 6. On the limiting faces of the magnetic body 9 extending transversely with respect to the direction of polarization are fixed the squared pole pieces 19, which comprise parts 19, 20' protruding from the magnetic element 9 and serving as pole shoes, which are provided with a semi-circular recess 21 in the range of the twist tube 6.

In FIGS. 6a, 6b and 6c, 1 illustrate another embodiment of the magnet which consists of two squared magnetic elements 9, 9 which are arranged as in the embodiment of FIG. 4, the polarization however extending in parallel with the axes of the twist tubes 6, 6. On both limiting faces of the magnetic bodies 9, 9 extending transversely with respect to the direction of polarization, are fixed squared magnetic pole pieces 22, 23, 24, 25. The magnetic elements with the magnetic pole pieces are fixed on the legs of the U-shaped support 26 of non-magnetic material, for example, brass. The pole pieces 22, 23, 24, comprise parts 22, 23', 24, 25 protruding from the magnetic elements 9, 9 and serving as pole shoes which are provided with recesses in the shape of circular sectors facing towards the twist tubes 6, 6'.

ln the embodiment of the magnet according to FIGS. 6a, 6b and 6c, the magnetic flux may either extend in the direction of the longitudinal axis of the twist tubes 6, 6' or transversely with respect to the same, depending on whether the magnetic elements 9, 9 are polarized in the same direction (H6. 611) or in opposite directions (FIG. 6c). In the modified embodiment of H6. 60, the twist tube, or tubes. 6, 6 consist of a tube 27 of hard metal the central portion of which is enclosed in a jacket 28 which essentially consists of nonmagnetic material and comprises in each of the zones situated opposite the pole shoes 22', 23 and 24', 25' a pack 29, 29 of sheet iron discs of low magnetic loss characteristics.

From the foregoing description, it will be seen that, in each embodiment, the magnet is so arranged that in no case does it protrude beyond the contour of the roller discs, i.e. the magnets do not extend beyond the disc radii which are perpendicular to those disc radii which, if extended, would pass through both shaft axes.

I believe that the construction and operation of my novel false twist device will now be understood, and that the advantages thereof will be fully understood by those persons skilled in the art.

I claim:

1. Device for false-twist texturing of textile yarns, comprising two axially parallel rollers rotatable around their axes and adapted to support at least one twist tube in a cuneal throat between the rollers and in tangential contact with the rims of the rollers and one magnet for pressing the same against the rollers, characterized in that the magnet (8) consists of at least one axially polarized magnetic element (9) and pole pieces fixed on limiting faces of the same, said magnet being shaped and arranged so that it does not protrude beyond the contours of the rollers.

2. Device according to claim 1, characterized in that the magnet (8) is shaped so that the magnetic flux extends through the same transversely with respect to the longitudinal axis of the twist tube or tubes 6, 6'.

3. Device according to claim 1, characterized in that the magnet (8) is shaped so that the magnetic flux extends through the twist tube or tubes 6, 6' in longitudinal direction.

4. Device according to claim 1, characterized in that the magnet (8) consists of at least one square magnetic element (9) with pole pieces fixed on limiting faces extending transversely with respect to the direction of polarization.

5. Device according to claim 2, characterized in that the pole pieces (11, 12) have pole shoes (13, 14) extending at an angle of with respect to the pole pieces.

6. Device according to claim 4, characterized in that the pole pieces (11,12) have pole shoes (13,14) extending at an angle of 90 with respect to the pole pieces.

7. Device according to claim 5, characterized in that the free pole shoe ends facing each other form parallel faces with each other.

8. Device according to claim 7, characterized in that the parallel pole shoe ends faces have broken edges facing towards the twist tube or tubes (6, 6').

9. Device according to claim 7, characterized in that the pole shoe ends are provided with recesses (15,15') in the shape of circular sectors in the range of the twist tube or tubes (6, 6).

10. Device according to claim 1, characterized in that the magnet consistsof two squared magnetic elements (9, 9) which are arranged on both sides of the twist tube or tubes (6, 6) and extend in parallel with respect to each other and transversely with respect to the line of connection between the roller axes.

11. Device according to claim 4, characterized in that the magnet consists of two squared magnetic elements (9, 9') which are arranged on both sides of the twist tube or tubes (6, 6) and extend in parallel with respect to each other and transversely with respect to the line of connection between the roller axes.

12. Device according to claim 10, characterized in that one of the pole pieces (16) is U-shaped, each of its legs being fixed on a limiting face of one of the two magnetic elements.

13. Device according to claim 3, characterized in that the pole pieces comprise pole shoes (19', 20; 22, 23', 24, 25') protruding from the magnetic element towards the twist tube or tubes.

14. Device according to claim 4, characterized in that the pole pieces comprise pole shoes (19', 20", 22, 23, 24', 25') protruding from the magnetic element towards the twist tube or tubes.

3 ,8 3 l ,366 5 6 v 15. Device according to claim 9, characterized in 16. Device according to claim 13, characterized in that the pole pieces comprise pole shoes (19, 20'; 22', that the pole shoes are provided with recesses (21) in 23', 24', 25) protruding from the magnetic element the range of the twist tube. towards the twist tube or tubes. 

1. Device for false-twist texturing of textile yarns, comprising two axially parallel rollers rotatable around their axes and adapted to support at least one twist tube in a cuneal throat between the rollers and in tangential contact with the rims of the rollers and one magnet for pressing the same against the rollers, characterized in that the magnet (8) consists of at least one axially polarized magnetic element (9) and pole pieces fixed on limiting faces of the same, said magnet being shaped and arranged so that it does not protrude beyond the contours of the rollers.
 2. Device according to claim 1, characterized in that the magnet (8) is shaped so that the magnetic flux extends through the same transversely with respect to the longitudinal axis of the twist tube or tubes 6, 6''.
 3. Device according to claim 1, characterized in that the magnet (8) is shaped so that the magnetic flux extends through the twist tube or tubes 6, 6'' in longitudinal direction.
 4. Device according to claim 1, characterized in that the magnet (8) consists of at least one square magnetic element (9) with pole pieces fixed on limiting faces extending transversely with respect to the direction of polarization.
 5. Device according to claim 2, characterized in that the pole pieces (11, 12) have pole shoes (13, 14) extending at an angle of 90* with respect to the pole pieces.
 6. Device according to claim 4, characterized in that the pole pieces (11,12) have pole shoes (13,14) extending at an angle of 90* with respect to the pole pieces.
 7. Device according to claim 5, characterized in that the free pole shoe ends facing each other form parallel faces with each other.
 8. Device according to claim 7, characterized in that the parallel pole shoe ends faces have broken edges facing towards the twist tube or tubes (6, 6'').
 9. Device according to claim 7, characterized in that the pole shoe ends are provided with recesses (15,15'') in the shape of circular sectors in the range of the twist tube or tubes (6, 6'').
 10. Device according to claim 1, characterized in that the magnet consists of two squared magnetic elements (9, 9'') which are arranged on both sides of the twist tube or tubes (6, 6'') and extend in parallel with respect to each other and transversely with respect to the line of connection between the roller axes.
 11. Device according to claim 4, characterized in that the magnet consists of two squared magnetic elements (9, 9'') which are arranged on both sides of the twist tube or tubes (6, 6'') and extend in parallel with respect to each other and transversely with respect to the line of connection between the roller axes.
 12. Device according to claim 10, characterized in that one of the pole pieces (16) is U-shaped, each of its legs being fixed on a limiting face of one of the two magnetic elements.
 13. Device according to claim 3, characterized in that the pole pieces comprise pole shoes (19'', 20''; 22'', 23'', 24'', 25'') protruding from the magnetic element towards the twist tube or tubes.
 14. Device according to claim 4, characterized in that the pole pieces comprise pole shoes (19'', 20''; 22'', 23'', 24'', 25'') protruding from the magnetic element towards the twist tube or tubes.
 15. Device according to claim 9, characterized in that the pole pieces comprise pole shoes (19'', 20''; 22'', 23'', 24'', 25'') protruding from the magnetic element towards the twist tube or tubes.
 16. Device according to claim 13, characterized in that the pole shoes are provided with recesses (21) in the range of the twist tube. 